About the exchange of messages on the deep-sea limits, I forgot to get the
reference of a recent paper - available in pdf (free) - on the
Mediterranean deep-sea which is a "summary" of my 15-year lectures on the
deep-sea at the Universidad de Valencia (Spain):
http://paleopolis.rediris.es/cg/CG2004_A01_CCE-PG/index.html
also in French version
All the best
Christian Emig